If p and q be positive integers, then the coefficients of and xq in the expansion of will be
Equal
Equal in magnitude but opposite in sign
Reciprocal to each other
None of these
of xq is (p+q)Cq
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50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pKb of ammonia solution is 4.75, the pH of the mixture will be : Option: 1 3.75 Option: 2 4.75
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